When to plant wildflower and beneficial insect mixes

I've been looking at some beneficial insect attracting seed mixes online and I'm thinking I'll sow it around and through my annual veggie patch as an easy way to increase diversity. The one I'm thinking of ordering is here http://www.uprisingorganics.com/flowers/wild-garden-insectary-mix/prod_69.html

I'm wondering when and how I would sow a mix like this. I'm in zone 8 in Bellingham. I would also like to grow wildflowers, including natives. Does anyone have any recommendations for a wildflower mix for this area, and again, planting time and technique. Thanks

I've heard you can plant wildflower mixes any time from Fall to Spring, since that's when the seeds would be falling from the flowers in the wild, but I think you would have the best success if you planted after the last frost date.